Boot upper



FIG. 1 is a perspective view of a boot upper;

FIG. 2 is a side, lateral view;

FIG. 3 is a side medial view;

FIG. 4 is a front view;

FIG. 5 is a rear view; and,

FIG. 6 is a top view.

The dashed lines in FIGS. 1-6 illustrate stitching and form a part of the claimed design.

The phantom lines in FIGS. 1-6 illustrate environment and form no part of the claimed design. The phantom lines are on the outsole at the bottom of the boot upper. 

CLAIM The ornamental design for a boot upper, as shown and described. 